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Campfire 'Bwana
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Campfire 'Bwana
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I bought a .375H&H CZ550 last summer and have been experimenting with loads since.
I started with Reloader 15 because I use it with my Whelens and from what I've read here. I never found a combination that was really accurate, using about four different bullets . Then I tried H4895 and results were no better. Then to my surprise I went to IMR4350 which is kind of considered a slow burning powder for the .375, but I've gotten much better results.
With this load:
Hornady brass
Winchester magnum LR primers
79.0 grns IMR 4350
270 grn TSX
COL 3.578"
This past weekend I shot two consecutive three shot groups right at 5/8" with this load. The only disappointment is that I measured only 2511 fps (average). It was a sunny day and sometimes I get inconsistent results with my chronograph, so I need to check that again next time we get a cloudy day. That's the problem with 4350 in the H&H in my experience as well, you simply can't get enough in the case to get standard velocity. I've had good luck with W-760 in several 375 H&H's.
I got banned on another web site for a debate that happened on this site. That's a first
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Campfire 'Bwana
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Campfire 'Bwana
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Yep, the .375 H&H seems to work best with mid range burn rate powders, RL-15 being the go to for many. And as posted earlier, Barnes shows Varget as their accy load for the 250 TTSX.
It would be interesting to see how some of the newer mid range powders, like CFR-223/Pwr Pro 2000 MR, IMR 4007ss, etc., would work. I've seen Big Game mentioned.
RL-15 has such a foot hold and works so well, looking around for other options may not be on anyone's bucket list...
DF
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Joined: Sep 2009
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Campfire 'Bwana
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Campfire 'Bwana
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Thanks, Bighorn.
Looks like the 250 TTSX did everything you asked of it.
It has been said, the TTSX with tip and bigger HP opens faster and wider than the TSX with smaller HP and no tip. That may be more of an issue with smaller calibers, not as much with bigger ones.
But, mono'e being mono's, and from your testimony, probably not a lot of terminal performance difference on game.
And, the 250 TTSX has some ballistic advantage over the 270 TSX. The 270 has a head start and a loyal following. It will be interesting to see if the 250 makes any gains on the 270.
DF Always knew you were a big bore speed freak!  😀 From you, gunner, that's a real compliment. DF LOL, You're most welcome.
Trump Won!
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Campfire 'Bwana
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Campfire 'Bwana
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I used W-760 back in the day to push the Hornady and Sierra 300 gr BTSP's to 2700 fps in one of my old 375 H&H's, thought I was in high cotton ;]
They damn sure shot great!
Trump Won!
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Joined: Nov 2010
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Campfire 'Bwana
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Campfire 'Bwana
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I guess a ball powder like 760 is denser, can get more in a case than a stick powder like 4350. In a previous post it was pointed out how hard it was to get enough 4350 in the case for optimal velocity.
Some have mentioned RL-17 for top velocities, others have mentioned Big Game. RL-17 is a high performer in a bunch of rounds. I've had great results with Big Game in the '06, very consistent, meters well.
I'm amazed by the variety of great components we have today, compared to when I started reloading in the late '60's. Big contrast, almost overwhelming the choices we now have, which is a high level problem, for sure.
It takes a lot of effort to test all these powders, more variables/possibilities than time.
DF
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Campfire Tracker
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I used W-760 back in the day to push the Hornady and Sierra 300 gr BTSP's to 2700 fps in one of my old 375 H&H's, thought I was in high cotton ;]
They damn sure shot great! If I'm not mistaken, W760 is the same powder as H414, which I use to push the 250 gr. TTSX bullets in my .375 Ruger.
I'd rather be a free man in my grave, than living as a puppet or a slave....
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Joined: Nov 2010
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Campfire 'Bwana
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Campfire 'Bwana
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From what I've read, 760 and H-414 are the same.
What 250 TTSX/414 load are you using in the .375 Ruger?
DF
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Campfire Ranger
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Campfire Ranger
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I used W-760 back in the day to push the Hornady and Sierra 300 gr BTSP's to 2700 fps in one of my old 375 H&H's, thought I was in high cotton ;]
They damn sure shot great! If I'm not mistaken, W760 is the same powder as H414, which I use to push the 250 gr. TTSX bullets in my .375 Ruger. Look at the St. Mark's MSDS info and it's pretty evident! :-) ![[Linked Image]](http://www.hunt101.com/data/556/Picture_34.png) ![[Linked Image]](http://www.hunt101.com/data/556/medium/Picture_25.png)
Sometimes, the air you 'let in'matters less than the air you 'let out'.
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Joined: Sep 2009
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Campfire 'Bwana
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Campfire 'Bwana
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I guess a ball powder like 760 is denser, can get more in a case than a stick powder like 4350. In a previous post it was pointed out how hard it was to get enough 4350 in the case for optimal velocity.
Some have mentioned RL-17 for top velocities, others have mentioned Big Game. RL-17 is a high performer in a bunch of rounds. I've had great results with Big Game in the '06, very consistent, meters well.
I'm amazed by the variety of great components we have today, compared to when I started reloading in the late '60's. Big contrast, almost overwhelming the choices we now have, which is a high level problem, for sure.
It takes a lot of effort to test all these powders, more variables/possibilities than time.
DF 10-4 on the 760 density, I did get enough IMR-4350 in my 375 hulls back in the day to reach 2700 with the 300's, my old Safari Grade Browning was tailor made for it, IIRC col's were 3.6" and I just neck sized the brass enough to get a slight crush on closing. Charges were in the lower to mid 80's with both 760 and 4350, they both gave equal accuracy, need a boot in the butt for selling that one too.
Trump Won!
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Joined: Sep 2009
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Campfire 'Bwana
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Campfire 'Bwana
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I used W-760 back in the day to push the Hornady and Sierra 300 gr BTSP's to 2700 fps in one of my old 375 H&H's, thought I was in high cotton ;]
They damn sure shot great! If I'm not mistaken, W760 is the same powder as H414, which I use to push the 250 gr. TTSX bullets in my .375 Ruger. You bet, I'm using RL-17 right now in a pre-64 375 I bought from BSA, have developed a very accurate 300 gr BBW #13 solid load that runs 2700 fps, it will cluster em dead on zero into a ragged 1" hole at 50 yards with the factory barrel sights. Can't wait to start load development with the 300 gr Partitions and RL-17, will be looking for 2700 fps and equal accuracy there too.
Trump Won!
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Campfire 'Bwana
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Campfire 'Bwana
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I used W-760 back in the day to push the Hornady and Sierra 300 gr BTSP's to 2700 fps in one of my old 375 H&H's, thought I was in high cotton ;]
They damn sure shot great! I compressed 4350 to the point it bulged my cases making clambering near impossible and still couldn't get up to speed with 270, 285, or 300 grain bullets.
I got banned on another web site for a debate that happened on this site. That's a first
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Joined: Nov 2004
Posts: 2,478
Campfire Regular
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Campfire Regular
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I got nearly 2800 fps with 270 grn TXSs using 76 grns of Re15, but accuracy was awful - in the range of 2-3 moa.
Not sure what to try next, maybe Winchester 748?
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Joined: Apr 2005
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Campfire 'Bwana
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Campfire 'Bwana
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I got nearly 2800 fps with 270 grn TXSs using 76 grns of Re15, but accuracy was awful - in the range of 2-3 moa.
Not sure what to try next, maybe Winchester 748?
No, not 748, use W-760. 760 worked very well for me in several 375 H&H rifles given excellent accuracy and top velocity.
I got banned on another web site for a debate that happened on this site. That's a first
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Joined: Sep 2009
Posts: 46,243
Campfire 'Bwana
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Campfire 'Bwana
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I used W-760 back in the day to push the Hornady and Sierra 300 gr BTSP's to 2700 fps in one of my old 375 H&H's, thought I was in high cotton ;]
They damn sure shot great! I compressed 4350 to the point it bulged my cases making clambering near impossible and still couldn't get up to speed with 270, 285, or 300 grain bullets. I've been a proponent of compacting denser slower powders for a given cartridge shape from the get go, max speed, lower pressures, did you use a drop tube? I had Gramps make me a 30 incher out of some copper tubing he had. 
Trump Won!
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Joined: Sep 2009
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Campfire 'Bwana
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Campfire 'Bwana
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I got nearly 2800 fps with 270 grn TXSs using 76 grns of Re15, but accuracy was awful - in the range of 2-3 moa.
Not sure what to try next, maybe Winchester 748?
No, not 748, use W-760. 760 worked very well for me in several 375 H&H rifles given excellent accuracy and top velocity. And don't forget the RL-17 in case your rifle doesn't care for the 760.
Trump Won!
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Joined: Nov 2010
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2010
Posts: 37,043 |
I used W-760 back in the day to push the Hornady and Sierra 300 gr BTSP's to 2700 fps in one of my old 375 H&H's, thought I was in high cotton ;]
They damn sure shot great! I compressed 4350 to the point it bulged my cases making clambering near impossible and still couldn't get up to speed with 270, 285, or 300 grain bullets. I've been a proponent of compacting denser slower powders for a given cartridge shape from the get go, max speed, lower pressures, did you use a drop tube? I had Gramps make me a 30 incher out of some copper tubing he had. I hope the family still isn't missing a section of copper tubing...  DF
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Campfire Tracker
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Campfire Tracker
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From what I've read, 760 and H-414 are the same.
What 250 TTSX/414 load are you using in the .375 Ruger?
DF In my .375 Ruger, I am using 83.0 gr. of H414 with the 250 gr. TTSX.
I'd rather be a free man in my grave, than living as a puppet or a slave....
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Joined: Sep 2009
Posts: 46,243
Campfire 'Bwana
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Campfire 'Bwana
Joined: Sep 2009
Posts: 46,243 |
I used W-760 back in the day to push the Hornady and Sierra 300 gr BTSP's to 2700 fps in one of my old 375 H&H's, thought I was in high cotton ;]
They damn sure shot great! I compressed 4350 to the point it bulged my cases making clambering near impossible and still couldn't get up to speed with 270, 285, or 300 grain bullets. I've been a proponent of compacting denser slower powders for a given cartridge shape from the get go, max speed, lower pressures, did you use a drop tube? I had Gramps make me a 30 incher out of some copper tubing he had. I hope the family still isn't missing a section of copper tubing... DF No stills were harmed in the making of this drop tube. 
Trump Won!
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Campfire Tracker
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Campfire Tracker
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Shooting almost the same load as the 2012 post. In my rifle it also shoots the 250 Sierra to the same POI so good for practice and they work fine on deer too.
Haven't tried R17 may get around to it someday just haven't felt the need as R15 performs so well in my rifle.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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